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  • Title: Bolo disease: a bacteriological survey.
    Author: Van Tonder EM, Colly PA, Vermeulen SO, Kellerman GE, De Ruiter A, Whitehead CJ.
    Journal: J S Afr Vet Assoc; 1990 Sep; 61(3):96-101. PubMed ID: 2287009.
    Abstract:
    A total of 718 sheep, 381 severely and 190 mildly affected with Bolo disease as well as 147 visibly unaffected animals emanating from 15 farms in the Stutterheim and Cathcart districts in the eastern Cape were subjected to bacteriological examination of skin surfaces and wool specimens. Altogether, 1,168 specimens were examined. These included skin swabs, skin scrapings and wool samples. Corynebacterium spp represented 94.4% of the primary isolates in cultures prepared from all specimens and 97.2% in those derived from skin swabs only, while a variety of other bacteria collectively constituted the remainder of primary isolates. In all, Corynebacterium spp was isolated from specimens of 94.2% of sheep severely affected with Bolo disease and from 83.7% of those mildly affected, whereas it could only be isolated from 1.36% clinically unaffected sheep. In a comparative study, swabs taken directly from the skin surface, proved to be the method of choice for the collection of specimens for bacteriological examination of Bolo disease. Using this method, Corynebacterium spp. was isolated from 98.7% of severely, and 85.3% of mildly affected sheep as well as 4% of sheep apparently unaffected by Bolo disease. The isolation of Corynebacterium spp. from skin scrapings collected from the 3 categories of affection (73.3%, 57.3% and 4% respectively) and from wool samples (52%, 41.3% and 1.3% respectively) proved these 2 methods of sampling to be less reliable. A close association has been established between the incidence of Corynebacterium spp. and the occurrence of clinical Bolo disease.
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